(navigation image)
Home American Libraries | Canadian Libraries | Universal Library | Community Texts | Project Gutenberg | Children's Library | Biodiversity Heritage Library | Additional Collections
Search: Advanced Search
Anonymous User (login or join us)
Upload
See other formats

Full text of "Text Book Of Mechanical Engineering"

Appendix II.

915

and the  next figures compare working cost   of various power-
producers.

COMPARATIVE COST OF ONE I.H.'P. HR.

Steam    ...        ...    \d.

(Lighting) .    \d. to \d.

Gas

\ (Poor)

\d. or less.

Petroleum         ...        ...    \d.

Electricity (from main) ...    2d.
Hydraulics (from main)...  i\d.

P.   7<9p.    Oil   Engines.—For   motor-cars   the   Priestman

•engine was too heavy, so Daimler and others designed lighter forms,
Fig. 878. There were two cylinders, side by side, having cranks
at 180°, and using the Otto cycle, so there was an explosion per
revolution. The charge of oil-vapour and air entered at A, the
exhaust leaving at B ; and the ignition tube c, of platinum, was
kept hot with a lamp. The oil, benzoline, flowed from reservoir
R through the chamber r>, at a slow and regular rate, controlled
by float E, and as it emerged at F was wafted into spray by the
suction air at a The exhaust-valve B was lifted every second
revolution by a cam j, worked from crank shaft by gearing.
Further information on motor-cars and their details is given in
the Appendices at pp. 947, 965, 999, and 1182.

Hot-air Engines.—These are sufficiently illustrated by the